Method and machine for forming a concrete path

ABSTRACT

An insertion device configured for connecting to a frame of a concrete paving machine. The insertion device including a housing, a guide tube extending from the housing, and an ejection device positioned in the housing and cooperating with the guide tube to individually eject dowels stored by the housing through the guide tube. According to one embodiment, the housing includes an alignment system for aligning the dowels in the housing in a predetermined orientation. In another embodiment, the housing has a parting feature that extends along a forward external side of the housing. In yet another embodiment, the guide tube includes a resilient element provided at an outlet portion that is arranged to seal the outlet portion of the guide tube.

CROSS REFERENCE TO RELATED APPLICATION

This application is a divisional application of U.S. patent applicationNo. Ser. 11/078,315, filed on Apr. 21,2005, which is acontinuation-in-part application of U.S. patent application No. Ser.10/216,848, filed on Aug. 13, 2002.

BACKGROUND

It is known to provide so-called dowels in concrete paths, usuallymostly at the location of joints, more particularly so-called loadtransfer joints, expansion joints or contraction joints. Such dowels arereinforcement bars with a length of approximately 0.5 m, which mostlyare provided in the concrete in the longitudinal direction of the pathto be formed. Contrary to traditional reinforcement bars, they mostlyconsist of smooth-surfaced bars used to form a load-transfer joint ofexpansion or contraction type. Classically, a whole series of suchdowels next to each other is provided at mutual interspaces of, forexample, 20 to 50 cm. After having provided the dowels in the concretepath and after the concrete possibly already has hardened, over eachseries of dowels, in the width of the concrete path, up to just abovethe dowels, a groove is formed, for example, cut, in the concrete, inorder to form the expansion joint.

With a possible expansion or contraction, the lower part then forms abreaking zone, whereas the dowels still form a connection between bothconcrete parts, limiting any vertical movement of the concrete, e.g.caused by load applied by the traffic.

According to a known technique, an example of which is known from U.S.Pat. No. 5,405,212, such dowels are provided in the concrete afterhaving formed the concrete path, when the concrete still is wet. To thisaim, a series of dowels is dropped in a controlled manner onto the wetconcrete surface, after which these dowels subsequently, by means ofvibrating forks, are vibrated into the formed concrete path up to awell-defined depth. Usually, this is performed by means of a devicesituated at the paving machine by which the concrete path is realized,which device, during the insertion of the dowels, temporarily is stoppedin respect to the concrete path, whereas the actual paving machinetravels on, whereby, after the insertion of the dowels, the respectivedevice is drawn forward.

This known technique has different disadvantages. An importantdisadvantage consists in that, as the dowels are inserted into thealready formed concrete surface, this surface is disturbed, as a resultof which an additional finishing operation, mostly by means of afinishing beam also fixed at the paving machine, must be provided for.Even when using such finishing beam, one will note that at the locationwhere the dowels have been inserted, a demixing or so-called segregationof the concrete takes place, resulting in a poor quality of the finallyobtained concrete surface.

Another disadvantage of said known technique consists in that suchpaving machine is relatively long, as a consequence of which it isdifficult to turn and difficult to transport, due to the fact that thedevice must be able to be stopped temporarily for inserting the dowels,whereas the paving machine travels on, and this device, thus, must bemovable in the longitudinal direction of the concrete path, over guideelements, as well as due to the fact that an additional finishing beamis required.

Another disadvantage of said known technique consists in that one neverknows with certainty whether the dowels are situated on the right placein the concrete, as they may come loose from below the vibrating forksduring insertion.

Also, inserting the dowels according to said known technique requires alarge power, for commanding and moving the device along the pavingmachine, as well as for pushing and vibrating the dowels into theconcrete.

In order to counteract the demixing of the concrete, it is already knownto realize a concrete path in two layers, whereby before providing thesecond layer, series of dowels are deposited on the first layer. It is,however, obvious that this, due to the fact that a double layer has tobe realized, is a complicated technique and/or a technique necessitatingthe use of rather complicated machines.

SUMMARY

The invention aims at a method and machine with which one or more ofsaid disadvantages can be excluded and according to which a concretepath provided with dowels can be realized in a very efficient manner.

To this aim, according to a first aspect, a method is described forforming a concrete path or the like, which concrete path is providedwith dowels, whereby unhardened concrete, by means of at least one formpiece moving over the concrete, is brought into the shape of theconcrete path to be realized. These dowels are brought into the concretein front of and/or at the height of the form piece, more particularlybefore and/or at the moment when the concrete surrounding the dowels isforced, by means of the form piece, into the shape of the concrete pathto be realized. In that the dowels in this manner are inserted beforethe actual concrete surface has been formed, it is excluded that thisconcrete must be disturbed afterwards. Thus, a demixing of the concreteneither will take place, as a result of which a concrete path with aperfect final quality can be guaranteed.

Of course, in this way there will be no necessity for using a finishingbeam, as a consequence of which the construction of the applied machinecan be particularly simple. However, this does not exclude that suchfinishing beam and/or other finishing elements, such as a smoothingboard moving to and fro, can be used.

According to one characteristic, the dowels are inserted into theconcrete such that, in a longitudinal direction, they are systematicallyenclosed by the concrete. It follows that the dowels are inserted orinjected in a generally horizontal manner in the concrete. Due to thismanner of insertion, there is no lateral movement of the dowels throughthe concrete, which further excludes the occurrence of a certaindemixing of the concrete.

According to another characteristic, the concrete is vibrated and thedowels are brought into the concrete at the location where the concreteis vibrated. Thereby, automatically a compacting of the concrete aroundthe dowels is taking place, without any form of demixing occurring.

According to another characteristic, for the insertion of the dowels inthe concrete use is made of a device with one or more insertion devicesfor dowels, and these insertion devices, at least during the periods oftime when dowels have to be inserted, are moved, together with themovement of the form piece, through the unhardened concrete which stillhas to be treated by means of the form piece. In consideration of thefact that the insertion devices substantially are situated in front ofthe form piece, these elements in fact can be permanently pushed throughthe rather raw concrete without causing any problem which is contrary toknown dowel apparatuses mounted behind the form piece. According to thisinventive characteristic, contrary to the known dowel apparatuses, noadditional means are necessary for blocking the insertion means in thelongitudinal direction of the concrete path and to draw them back to thepaving machine after an insertion cycle.

It is clear that in such case, the insertion devices, at least at theirlower ends, are located at a distance from each other, thereby providingpassages for the concrete between these elements. An important advantagehereby is that the concrete can be poured in front of the insertiondevices, and still better in a traditional manner in front of thecomplete paving machine. This technique is less critical than in thecase that the concrete would be supplied in between the insertiondevices and the form piece.

In an embodiment of a paving machine, an insertion device is used forinserting the dowels which comprises several feeding elements providednext to each other at regular interspaces, in order to bring therebyseveral dowels next to each other into the concrete, and the concrete isvibrated by means of different vibrating elements which are positionedbetween the respective insertion devices.

According to another embodiment, for the insertion of the dowels in theconcrete, at least one insertion device is provided and dowels arepushed out of this insertion device in a longitudinal direction andthereby inserted into the concrete. As a consequence thereof, the dowelsare put into the concrete in a particularly uniform manner.

In a practical view, the dowels are inserted by keeping them ready inthe insertion devices, in the longitudinal direction of the concretepath, and subsequently, at the moment when they have to be brought intothe concrete, releasing them from the insertion devices according totheir longitudinal direction. As this takes place according to thelongitudinal direction, the surrounding concrete is not disturbed andthe risk of demixing is minimized.

Preferably, the dowels are kept ready in a guide tube or centering partand/or sealing part, from where the dowels, through an exit opening, arebrought outside one after the other. This centering part and/or sealingpart preferably is oblong and slim, such that it is easily enclosed bythe concrete and subsequently this concrete connects around the releaseddowels in an efficient manner.

More particularly, it is preferred that the dowels are expelled by meansof a centering part and/or sealing part; that at a location where adowel has to be inserted, such dowel is kept ready in the centering partand/or sealing part; that a second dowel is provided behind said dowel,in the prolongation thereof; and that during inserting, the first dowelis pushed outside by the movement of the second, after which the seconddowel becomes located in the centering part and/or sealing part, readyfor a subsequent cycle. This technique offers the advantages that thedowels simply can be brought from the insertion devices to the outside,as well as that no concrete can penetrate into the insertion device, asthe place of each inserted dowel immediately is taken by another.

According to another embodiment, the dowels are released from theinsertion devices by moving them in a direction of movement in respectto the insertion devices moved through the concrete which is opposed tothe direction of movement of the insertion devices, however, with aspeed which is equal to, or approximately equal to, the speed of theinsertion devices traveling through the concrete. Hereby, it is achievedthat the dowels during inserting are standing still in respect to theambient concrete and that the concrete sets around them. This alsocontributes to preventing any form of demixing of the concrete.

It is noted that the characteristic, according to which the dowels areinserted at the location where the concrete is vibrated, as well as thecharacteristic according to which the dowels are inserted such into theconcrete that they systematically are surrounded by the concrete in alongitudinal direction, form characteristics which minimize the risk ofdemixing of the concrete. In addition, they also may be applied apartfrom the fact whether the dowels are inserted into the concrete at alocation in front of the form piece and/or at the height of the formpiece.

According to another aspect, a method for forming a concrete path or thelike is provided, which concrete path is provided with dowels, whereinunhardened concrete, by means of at least one form piece moving over theconcrete, is brought into the shape of the concrete path to be realized,with as a characteristic that the concrete is vibrated and that thedowels are inserted into the concrete at the location where the concreteis vibrated. As the dowels are inserted at the location where theconcrete is vibrated, in fact a compacting of the concrete around thedowels is created, without having a demixing occurring, regardlesswhether the insertion now takes places in front, below or behind theform piece.

According to yet another aspect, a method for forming a concrete path orthe like is provided, which concrete path is provided with dowels,wherein unhardened concrete, by means of at least one form piece movingover the concrete, is brought into the shape of the concrete path to berealized, with as a characteristic that the dowels are inserted suchinto the concrete that, in longitudinal direction, they aresystematically surrounded by the concrete.

It is clear that these inventive characteristics can be combined atrandom, whereby it is obvious that certain combinations may offeradditional advantages.

Further, according to another embodiment, a paving machine for forming aconcrete path according to the methods described heretofore is provided.Such machine at least comprises a movable frame, to which a form piecefor forming the concrete path is attached, as well as a device forinserting dowels, and, has the characteristic that the device forinserting dowels is situated, according to the travel direction of themachine, in front of and/or at the height of the form piece.

It is clear that the invention also relates to an insertion device forinserting dowels which allows to realize the method, as well as a pavingmachine according to the invention. Of course, such devices may beconstructed as units for separate attachment at a paving machine.

It is noted that such device, regardless of the fact whether it fixedlybelongs to a certain paving machine or not, can be made modular, as aconsequence of which it may easily be adapted to different workingwidths and/or the interspaces between the dowels situated next to eachother may easily be adapted. It is also not excluded to realize thedevice telescopically adjustable according to the working width, forexample, by applying a series of insertion units which are suspended ata telescopic frame and which, in function of the span of the telescopicframe, all systematically are suspended farther or less far from eachother, whereby possibly certain units, when suspended too close to eachother, can be taken out of operation.

According to an embodiment of the insertion device, the housing includesan alignment system for aligning the dowels in the housing in apredetermined orientation. The alignment system includes a pluralityorientation elements disposed on opposed interior sides in the upperportion of the housing that may be arranged in a staggered relationship.

In a variation of this embodiment, the alignment system includes aspring element that is connected to the upper portion of an interiorwall of the housing. The spring element may extend into the interiorcavity toward the lower portion of the housing so that the springelement prevents a second dowel from dropping onto a first dowel that islocated along the lower portion of the housing.

In another variation of this embodiment, a wiping apparatus may bedisposed in the lower portion of the housing. The wiping apparatus isarranged for receiving a dowel and permitting transfer of a doweltherefrom through the guide tube by the ejection device.

In yet another variation of this embodiment, a monitoring device may bedisposed in the lower portion of the housing. The monitoring device canprovide an indication as to the alignment of a dowel within the interiorcavity of the housing. The monitoring device may be combined with thewiping apparatus into a single unit whereby the monitoring device isintegrated or cooperates with the wiping apparatus.

According to another embodiment of the insertion device, the housingincludes a parting feature that extends between the upper and lowerportions on a forward external side of the housing. In a variation, theparting feature is defined by a knife edge generally orientedperpendicular to the longitudinal axis of the frame.

In a variation of this embodiment, a nozzle is defined at the lowerportion of the housing to provide access from the external side into theinternal cavity. A plug may be provided which is configured forinsertion in the nozzle. In addition, a forward end of the plug may havea parting feature that is generally oriented perpendicular to thelongitudinal axis of the frame.

According to yet another embodiment of the insertion device, the guidetube has an outlet portion that is defined at a first end remote fromthe housing, and a resilient element is provided at the outlet portionto seal the outlet portion when the guide tube is empty. The resilientelement is positioned on the guide tube so that a first end portion ofthe resilient element extends outwardly from the first end of the guidetube. The resilient element comprises two positions wherein the firstposition the resilient element surrounds a dowel when the dowel isinserted in the guide tube, and in the second position the first end ofthe resilient element collapses to seal the outlet portion of the guidetube.

It will be noted that it is envisioned that the insertion device mayinclude each of the aforementioned features individually or incombinations thereof. Thus, it is clearly intended that the insertiondevice may include the alignment system, parting feature, resilient sealand other features herein described.

BRIEF DESCRIPTION OF THE DRAWINGS

With the intention of better showing the characteristics according tothe invention, hereafter, as an example without any limitativecharacter, a preferred form of embodiment is described, with referenceto the accompanying drawings, wherein:

FIG. 1 schematically, in side view and partially in cross-section,represents a paving machine according to the invention;

FIG. 2 schematically represents a cross-section according to line II-IIin FIG. 1;

FIGS. 3 to 6, at a larger scale and for different positions, representthe part indicated by arrow F3 in FIG. 1;

FIGS. 7 and 8 represent cross-sections according to lines VII-VII andVIII-VIII, respectively, in FIG. 4;

FIG. 9, at a larger scale, represents the part indicated by arrow F9 inFIG. 4.

FIG. 10 shows an elevational side view of an embodiment of an insertiondevice;

FIG. 11 shows an elevational frontal view of the insertion device ofFIG. 10;

FIG. 12 shows an elevational rear view of the insertion device of FIG.10;

FIG. 13 shows a top view of the insertion device of FIG. 10;

FIG. 14 shows a bottom view of the insertion device of FIG. 10; and

FIG. 15 shows a partial view of an embodiment of the guide tube.

DESCRIPTION OF PREFERRED EMBODIMENTS

As represented in FIG. 1, a machine, more particularly a paving machine1, for forming a concrete path 2 is provided with dowels 3.

The paving machine 1 comprises a frame 4, whether or not extensible inwidth and/or length, and which is movable by means of support elements 5situated, for example, at the comer points, which elements are provided,for example, with crawler tracks 6 which can be driven by means ofmotors which are not represented in the figures.

At the frame 4 and/or at the support elements 5, different tools areattached for realizing the concrete path 2. Depending on theapplication, either several tools are applied or not. In the example ofFIG. 1, these tools consist of, respectively, schematically indicatedconcrete spreader 7 for spreading concrete 8 poured in front of thepaving machine 1, a apparatus 9 for inserting the dowels 3, means 10 forvibrating the concrete, one or more form pieces 11 and a finishingelement 12.

The concrete spreader 7 may be of different kind and consist, forexample, of a plough for spreading the concrete 8 and/or a drivenelement, such as a worm screw for distributing the concrete 8.

As represented in FIGS. 1 and 2, the means 10 for vibrating the concretepreferably consist of a series of internal vibrators in the shape of aneedle, further called vibrating elements 13, which, during thetreatment of the concrete 8, reach up into the concrete 8, preferably upto below the form piece 11. Such vibrating elements 13 may consist in aknown manner of cylindrical elements in which driven excenter weightsare provided, the speed of which preferably can be regulated.

The form piece 11 substantially consists of a large mould with which theconcrete is pressed into a certain shape and simultaneously is given asmooth surface. When producing a classical concrete path, the form pieceis made in a straight manner, for example, as a profile with across-section, such as represented in FIG. 1, which extends over theworking width. It is clear that it may also have special shapes and maybe composed of several parts, for example, for forming a gutter, astanding edge or the like at a concrete path.

The form piece 11 defines a leading edge 36, a forming surface 38extending towards a trailing end of the frame 4, and a transition point40 whereat the leading edge 36 merges with the forming surface 38.

The form piece 11 defines a leading edge 36, a forming surface 38extending towards a trailing end of the frame 4, and a transition point40 whereat the leading edge 36 merges with the forming surface 38.

Also, several of such form pieces may be applied which can be displacedalong each other, such that the working width can be adapted. When inthe following, a form piece is mentioned, it is clear that this is alsovalid for embodiments where several such form pieces are present.

In FIG. 1, the finishing element 12 comprises a smoothing board whichcan be moved systematically over the formed surface 14 of the concretepath 2.

Of course, the concrete spreader 7 and the finishing element 12 areoptional.

According to one embodiment of the paving machine, apparatus 9 forinserting dowels 3, according to the travel direction V of the pavingmachine 1 during paving, is situated in front of and/or at the height ofthe form piece 11, contrary to known embodiments whereby the dowelapparatus is mounted behind the form piece.

Such as clearly visible in FIG. 2, the apparatus 9 substantially iscomposed of, on one hand, a series of insertion devices 15 for insertingdowels 3, positioned adjacent to each other at regular interspaces, and,on the other hand, a drive device 16 cooperating therewith.

The insertion devices 15 are suspended such at the frame 4 that they,during the operation of the machine 1, anyway, at least during theperiods of time when dowels 3 have to be brought into the concrete 8,reach up into the concrete 8 situated in front of the form piece 11,more particularly are hanging down into the concrete with theirundersides.

The insertion devices 15 and the vibrating needles 13 are positioned inan alternating manner adjacent to each other, distributed over theworking width, as clearly represented in FIG. 2.

As represented in FIGS. 3 to 8, the insertion devices 15 compriseupwardly directed elements, each with a housing 17 of a small widthextending substantially in a vertical plane parallel to the traveldirection of the machine 1. Each housing defines upper and lowerportions.

These insertion devices 15 each comprise two compartments situatedadjacent to each other, on one hand, a first compartment 18 functioningas a magazine and in which dowels 3 can be stacked horizontally one uponthe other and, on the other hand, a second compartment 19 forming apassage for a pressing mechanism pertaining to the drive device 16, moreparticularly a ejection device 20, which ejection device 20 in fact canbe considered as a device for horizontal injection of the dowels.

The ejection devices 20 of the respective insertion devices 15, which,in the represented example, comprise vertical rods, are coupled at theirupper side to drive elements pertaining to the drive device 16,according to one embodiment, two simultaneously movable pressurecylinders 21, in such a manner that all ejection devices 20simultaneously can be subjected to a to-and-fro movement S. To this aim,the ejection devices 20 are connected at their upper portion to atransverse profile 22 extending according to the working width of themachine 1, which profile, in its turn, is movable in that it is coupled,as represented in FIGS. 2 to 7, to the piston rods 23, which can bemoved in and out, of the pressure cylinders 21. Hereby, the transverseprofile 22 can be shifted over guides 24.

At their lower portion, the ejection devices 20 are provided with alaterally directed cam 25, as a result of which they can cooperate, bymeans of an open connection, more particularly a passage 26, between thetwo compartments 18-19, with a dowel 3 situated below in the firstcompartment 18.

It is obvious that instead of two pressure cylinders 21, also otherdrive devices may be applied, whether or not they are common to therespective insertion devices 15.

To the lower portion of the rear wall 28 of each compartment 18, next tothe bottom thereof, a guide tube 28 is connected which consists of arelatively slim element, with a through-channel 29 which, on one hand,gives out in the magazine for the dowels 3 and, on the other hand, atits free portion, forms an outlet opening 30 for the dowels 3. Thisguide tube 28 extends parallel to the movement direction of the pavingmachine 1 and usually is situated such that the outlet opening 20,viewed according to the thickness of the concrete path 2 to be realized,is situated approximately in the middle thereof, as well as it issituated below the front half of the form piece 11, and still moreparticularly, at the height of the extremities of the vibrating elements13.

As represented in greater detail in FIG. 9, the guide tube 28 preferablyconsists of an exchangeable sleeve in which two support points for thecentered holding of the dowels 3, in the form of sealing rings 31-32,are provided. Due to the exchangeability, it is possible to providesleeves for dowels 3 of different diameters and/or lengths.

The guide tube 28 preferably extends with such a length behind the rearwall 27 that, during the presence of one dowel 3 in this part 28, stilla second dowel 3 from of compartment 18 can be positioned therebehind.

Further, the apparatus 9 is equipped with a detection device 33 whichcan cooperate with guide elements 34, erected next to the paving path,for example, small posts provided especially to this aim, and thereby itcan activate the drive device 16.

The functioning of the paving machine 1, and more particularly of theapparatus 9, can easily be deduced from the figures and substantially issuch as explained hereafter.

First, a sufficient number of dowels 3 is provided in the compartments18. In rest position, each ejection device 20 is situated with its cam25 behind the lowermost dowel 3 present in the pertaining magazine.Initially, the pressing elements 20 then are moved once to and fro, byhaving the piston rods 23 once go in and back out. As a result thereof,a condition ready for an operation cycle is created, as illustrated inFIG. 3, whereby at the bottom, two dowels 3 are situated axially onebehind the other, one of which is situated in the guide tube 21, inreadiness for being applied.

When forming the concrete path 2, concrete 8 is poured in front of thepaving machine 1. This concrete 8 first is roughly spread by saidconcrete spreader 7, after which, by means of the form piece 11, theactual concrete path 2 is formed. An additional smoothing movement maybeperformed by means of the finishing element 12.

At the moment when the concrete gets under the form piece 11, it isvibrated by means of the vibrating elements 13, as a result of which iscompacted and homogenized.

During paving, the insertion devices 15 are sliding through the concrete8.

When a series of dowels 3 has to be inserted, this is taking place inthe manner as depicted systematically in FIGS. 3 to 6.

To this aim, the pressing elements 20, which originally are in thestarting position of FIG. 3, are subjected to a backward displacement Sby having the piston rods 23 go in. The activation of the piston rods 23hereby is, for example, the consequence of a signal delivered by saiddetection device 33. Of course, such activation also can be commandedmanually by applying an appropriate control signal to the pressurecylinders 21.

Due to the displacement of the pressing elements 20, first of all acondition is created as in FIG. 4, whereby the lowermost dowel 3 ispushed from the magazine into the guide tube 28, whereas the dowel 3previously present therein is pushed outward.

The drawing in of the piston rod 23, and more particularly thedisplacement of the ejection devices 20, is performed at a speed whichis equal to the traveling speed of the paving machine 1. On account ofthe fact that the direction of displacement of the ejection devices 20in respect to the insertion devices 15, however, is opposed to thetravel direction of the paving machine 1, this results in the fact thatthe dowels 3 which leave the insertion devices 15 are kept at astandstill in respect to the surroundings, whereas the insertion devices15 move forward and thereby release the respective dowels 3. This speedcan be regulated by means of appropriate, not-represented control means.

As a consequence, the dowels 3, being released and inserted into theconcrete 8, are, according to their longitudinal direction,systematically surrounded by the concrete, whereby, also as a result ofthe effect of the vibrating elements 13, a good compacting of theconcrete 8 around the dowels 3 is obtained.

Finally, a condition is created, as depicted in FIG. 5, whereby saidsecond dowel 3 each time becomes located in the guide tube 28, whereasthe first dowel 3 is sitting freely in the concrete 8. In considerationof the fact that the paving machine 1 is traveling on, the first dowel,as depicted in FIG. 6, remains in the concrete path 2, whereas thesecond dowel is carried along in the guide tube 28.

By moving the ejection devices 20 back, again a starting condition, asrepresented in FIG. 3, is created.

The functioning explained heretofore also illustrates the methoddescribed in the introduction.

Of course, different variants are possible. The main idea of theinvention consists in that the dowels 3 are brought into the concrete 8in front of or at the height of the form piece 11, and it is clear thataccording to the invention, this may be realized in any other mannerthan described in the aforegoing.

So, for example, this must not necessarily be realized by means ofinsertion devices 15 which are equipped with magazines for severaldowels 3.

It is also possible to provide an automatic supply system for dowels,more particularly for filling the magazines, above the insertion devices15.

Also, different parts may be made adjustable, exchangeable and/ormodular.

So, for example, is it possible to apply adaptable side walls in thecompartments 18, as a result of which the length and diameter of thecompartments 18 can be adjusted in function of the length of the applieddowels 3. Also the depth at which the insertion devices 15 are hangingin the concrete 8, as well as the location where these insertion devices15 are attached in the width of machine 1, can be adjustable.

Although the dowels preferably are inserted parallel to the traveldirection of the paving machine, it is not excluded to realize this at aslight angle of, for example, 15 degrees. To this end, the insertiondevices 15 can be adjusted at an angle.

Due to the fact that the insertion devices 15 are pushed through theconcrete, the magazines can be located quite close to the form piece,which offers several advantages, such as a more stable construction. Ina preferred embodiment, this distance is less than the maximum length ofthe dowel bars for which the magazines have been designed.

As illustrated in FIGS. 10-14, the insertion device may include analternate housing 40 and a guide tube 42 that extends from the housing40 and is supported, at least in part, by a reinforcing member 44connected to both a rear side 50 of the housing 40 and the guide tube42. The guide tube 42 defines an outlet portion 46 that is located atand near an end of the guide tube 42 remote from the rear side 50 of thehousing 40.

According to this embodiment, an alignment system is provided foraligning dowel bars contained in the housing in a predeterminedorientation. The alignment system includes a plurality orientationelements 58 disposed on opposed interior sides of the housing 40 thatare arranged in a staggered relationship in an upper portion 54 of thehousing 40.

The orientation elements 58 may be constructed of metallic strips thatare secured to the interior walls of the housing and may be coated withappropriate materials that will resist wear of the strips.

The alignment system includes a spring element 60 that is connected tothe upper portion 54 of an interior wall of the housing 40. The springelement 60 may extend into an interior cavity 48 of the housing toward alower portion 56 of the housing 40 so that the spring element 60 canprevent a second dowel bar contained in the interior cavity 48 frombeing loaded upon a first dowel bar located along the lower portion 56of the interior cavity 48.

According to this embodiment, a top flange 64 is connected to the upperportion 54 of the housing 40 and the upper portion 54 has a taperedopening 66 that is configured as a funnel for receiving dowel bars.

In addition to the alignment system, a wiping apparatus 68 is mounted inthe lower portion 56 of the interior cavity 48. The wiping apparatus 68is arranged for receiving a dowel bar and permitting transfer of a dowelbar therefrom through the guide tube 42. The wiping apparatus 68 isparticularly employed for wiping any dirt or other debris that may becarried by a dowel bar prior to insertion into concrete. By wiping thedowel bars prior to insertion into concrete, dirt or other debris may beremoved so as to provide effective deposition of dowel bars through theguide tube and into wet concrete. Any dirt or debris wiped from thedowel bars is intended to collect below the wiping apparatus 68 at thelower portion 56 of the interior cavity 48.

According to one variation shown in FIG. 14, the wiping apparatus 68includes opposed strips provided on opposed sides of the interior cavity48 which wipe sides of the dowel bars. The wiping apparatus 68 may beconstructed from any known material that sufficiently removes dirt anddebris from dowels. For example, the wiping apparatus may comprise aplurality of sliding strips constructed from rubber.

A monitoring device 70 is disposed in the lower portion of the interiorcavity 48. The monitoring device 70 provides an indication as to thealignment of a dowel within the interior cavity 48, in particular in thelower portion 56. The monitoring device 70 may be combined with thewiping apparatus 68 into a single unit whereby the monitoring device 70is integrated and cooperates with the wiping apparatus 68.

According to one variation, the monitoring device 70 is an electricalswitch that sends a relay to an operator of the paving machine to verifythat the dowel bars are in a proper placement in the housing 40.

Another feature of this embodiment is that the forward surface 52 of thehousing 40 includes a parting feature 72 that extends between the upperand lower portions 54, 56 of the housing 40. In this embodiment, theparting feature 72 is defined by a leading edge 74 that is generallyoriented perpendicular the longitudinal axis of the housing 40.

The parting feature 72 is particularly advantageous in that it allowsthe housing 40 to cut through poured concrete in accordance with themethod and description of the paving machine described in FIGS. 1 and3-6 since less resistance is formed by the forward surface of thehousing 40 than with a conventional housing.

A nozzle 76 is defined at the lower portion of the housing 40 to provideaccess from the external side 52 into the internal cavity 48. A plug 78is provided which is configured for insertion in the nozzle 76. Inaddition, a forward end of the plug 78 has a leading edge 80 that isgenerally oriented parallel to the leading edge 74 of the partingfeature 72.

The nozzle 76 facilitates cleaning of the interior cavity 48 of thehousing, and the leading edge 80 of the plug 78 serves a functionsimilar to the parting feature 72.

As shown in FIG. 15 in yet another feature of the insertion device, theoutlet portion 46 of the guide tube 42 includes a resilient element 84that is provided to seal the outlet portion 46 when the guide tube 42 iswithout a dowel bar inserted therein.

According to one variation, the resilient element 84 is inserted into afirst end of the guide tube 42 and protrudes at least a portionoutwardly from the first end of the guide tube 42. A sleeve 86 issecured to an external surface of the guide tube 42 and biases theresilient element 84 inwardly towards a longitudinal axis of the guidetube 42.

The resilient element 84 comprises two positions wherein the firstposition the resilient element 84 surrounds a dowel bar 88 inserted inthe guide tube 42. In the second position (not shown), the resilientelement collapses about longitudinal axis A of the guide tube 42 to sealthe outlet portion 46.

The resilient element 84 assists in sealing the first end of the guidetube 42, whether or not a dowel bar is loaded in the guide tube 42.

It will be noted that it is envisioned that the insertion device mayinclude each of the aforementioned features individually or incombinations thereof. Thus, it is clearly intended that the insertiondevice may have at least one of the aforementioned features.

The present invention is in no way limited to the forms of embodimentdescribed by way of example and represented in the figures, on thecontrary may such method and machine for forming a concrete path or thelike, as well as the device for inserting the dowels used therewith, berealized according to various variants without leaving the scope of theinvention.

1. An insertion device configured for connecting to a frame of aconcrete paving machine that defines a longitudinal axis extendingbetween forward and rearward ends, comprising: a housing defining upperand lower portions and having an interior cavity arranged to contain aplurality of dowels, the housing including a parting feature extendingbetween the upper and lower portions on a forward external side of thehousing; a guide tube extending from the lower end portion of thehousing; and an ejection device positioned in the housing andcooperating with the guide tube to individually eject dowels stored bythe housing through the guide tube.
 2. The insertion device according toclaim 1, wherein the parting feature is defined by a leading edgegenerally oriented perpendicular a longitudinal axis of the housing. 3.The insertion device according to claim 1, further comprising a nozzledefined at the lower portion of the housing and a plug configured forinsertion in the nozzle, a forward end of the plug having a partingfeature generally oriented perpendicular a longitudinal axis of thehousing.
 4. The insertion device according to claim 1, wherein theparting feature is defined as a leading edge oriented perpendicular to alongitudinal axis of the housing.
 5. The insertion device according toclaim 1, further comprising a reinforcing member connected to a rearexternal side of the housing and the guide tube.
 6. The insertion deviceaccording to claim 1, further comprising a spring element connected toan interior wall of the housing, the spring element extending into theinterior cavity toward the lower portion of the housing.
 7. Theinsertion device according to claim 1, further comprising a wipingapparatus disposed in the lower portion of the interior cavity of thehousing and arranged for receiving a dowel and permitting transfer of adowel therefrom through the guide tube by the ejection device.
 8. Theinsertion device according to claim 1, further comprising a monitoringdevice disposed in the lower portion of the interior cavity, themonitoring device providing an indication as to the alignment of a dowelwithin the interior cavity of the housing.